Telephone-receiver



L. STEINBERGER.

TELEPHONE RECEIVER. APPLICATION men FEB. 28. 1919.

1,366,607. Patented Jan. 25, 1921.

UNITED STATES PATENT OFFICE.

LOUIS STEINBEBGER, BROOKLYN, NEW=YORK.

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Specification of Letters Patent.

Patented Jan. 25, 1921.

Application filed February 28, 1919. Serial No. 279,766.

of'New York, have invented certain new and useful Improvements in Telephone Re- "ceivers, of which the following is a specification.

My invention relates to telephone receivers wherein variations in the current, flowing through a talking telephone circuit produce changes in the magnetic flux emanating from a magnet, with concomitant changes in the force exerted by the magnet upon a vibratory soft iron diaphragm operated thereby.

One of the objects of my invention is to provide a construction of a receiver whereby the vibrations set up in the air by the v1 bratin diaphragm upon each ofits sides are utilized to set up sound waves which pass to the earv of the listener whereby a better speech reproducing effect is secured.

Another object of my invention is to provide a construction by means of which the diaphragm is free to vibrate due to air conduits extending from one side of the diaphragm to the other.-

Other objects will appear from the subjoined specification and claims.

In the drawing. Figure 1 is a view partly section and partly inelevation of a central longitudinal plane of a telephone receiver embodying my invention.

Fig. 2 is a plan view of the device shown in Fig. 1.

In the drawing, 5 designates the exterlor casing of a telephone receiver, the same being made either of electrose or hard rubber or similar non-metallic insulating material having an open end across which the vibratory diaphragm 6 extends. The diaphragm is held in place by a cap 7 made of material similar to that of which the casing 1s made and having threaded connection therewith at 8 apart from the diaphragm whereby a chamber 9 is provided between the cap and the diaphragm 6 leadin to the atmosphere through an opening and a chamber 10 is provided on the under side ofthe diaphragm, as clearly shown in the drawlng.

The magnetic elements, in the interest of clearness, are not shown, and it 1s deemed sufficient only to say that they may be of any suitable form as my invention is in no way concerned with the details of the magnet whereby the diaphragm is caused to vibrate.

In the drawlng there is illustrated a construction by means of which a free communication between the front and rear sides or faces of the vibrating diaphragm 6 is established through conduits 21 formed as elements separate from the cap 7 and the casing 5 of the receiver. The respective ends of the conduits are secured in holes 25 and i '26 provided respectively in the cap and in the casing, as shown. A construction is thereby provided whereby my invention may be readily applied to existing telephone recelvers for in that case all that is necessary to do in order to so install my invention to '1 existing telephone receivers is to provide the holes 25 inthe cap and the holes 26 in the casing within which the ends of the condults 21 are secured. These tube forming conduits may be used singly or in any nun! ber, but I have chosen to illustrate only four of such tubes in the drawing, as four are amply sufficient for the purpose desired. The tubes may be formed of any suitable material, among which may be mentioned metal or rubber, either of which materials will permit the conduit-formed therefrom to be readily put in place with its ends within the holes provided to receive it;

In view of the above description of the construction embodying my invention, it is only necessary to refer briefly to the other elements of the telephone receiver.

As clearly shown, a chamber 9 is provided between the front side of the diaphragm and adjacent inner wallof the cap 7, and another chamber 10 on the rear side of the diaphragm, this last mentioned chamber being within a cup-shaped shell 30 which rests within the upper end of the casing and which is provided with a flange 31 which rests on the upper face 15 of the casing, the flange of the shell and the diaphragm being clamped between the casing and the cap, as clearly shown. The conduits 21 thus situated obviously provide a permanently open communication between the chambers 9 and 10, such communication extending around the edge of thediaphragm. Theperimeter of the diaphragm rests upon the outwardly extending flange 31 as hereinbefore mentioned, though this flange may however be omitted, as it is not necessary for the formation of a closed junction between the cap and the casing. I

As shown in the drawing, the holes 26 in the casing are in respective alinement with the holes 27 in the metallic shell 30. The holes 25 and the holes 26--27 may be bored after the parts are assembled, thus securing the alinement of the holes 26 with the holes 27.

As changes of'construction could be made within the scope of my invention, it is intended that all matter contained in the above description or shown in the accompanying drawings shall be interpreted as illustrative and not in a limiting sense.

Having thus described my invention what I claim as new and desire to secure by Letters Patent is:

1. A telephone receiver, a vibratory diaphragm, a cap, a casing, means for securing said cap, diaphragm and easing together, said cap being provided with an air space on one side of the diaphragm leading through a central opening to the atmosphere,

tioned conduits to form a free passage therebetween.

2. In a telephone receiver, a vibratory diaphragm, an integral cap, a casing, a chamber having an open end, means for securing said cap and easing together with said chamber seated in said casing and said diaphragm disposed so as to close the open end of said chamber, said cap being provided with an air space, and a tube leading from said air space to said chamber.

8. In a telephone receiver, a vibratory diaphragm, an integral cap, a casing, a chamber having an open end, means for securing said cap and casing together with said chamber seated in said casing and said diaphragm disposed so as to close the open end of said chamber, said cap being provided with an air space opposite said chamber leading to the atmosphere, and a tube leading from said air space to said chamber.

In witness whereof, I have hereunto set my hand at the borough of Manhattan, city and State of New York, this 26th day of February, 1919.

LOUIS STEINBERGER. In presence of ZITA M. GRAHAM. 

